A denied health insurance claim isn't necessarily a final answer. Insurers are required to have an appeals process, and a meaningful percentage of appeals — particularly those supported by documentation from your physician — result in the original denial being reversed. Understanding how the appeals process works, and how to navigate it effectively, can make the difference between absorbing a large unexpected bill and having it covered as originally expected.
Understanding the actual denial reason first
Before appealing, get a clear, specific explanation of why the claim was denied — common reasons include a service deemed not medically necessary, a provider considered out-of-network, or missing prior authorization. The appeal strategy differs significantly depending on which of these applies, so understanding the specific reason is the essential first step. Your insurer is required to provide a written explanation of any adverse benefit determination, including the specific reason for denial and the clinical criteria applied. Request this if it wasn't included with the denial notice.
Time limits apply to appeals. Most plans require internal appeals to be filed within a specific window — often 180 days — from receiving the denial. Missing this deadline can forfeit your right to appeal entirely, so treating a denial as time-sensitive even if the underlying issue feels uncertain is worthwhile.
Internal appeals: the first step
An internal appeal goes directly to your insurer for review by someone not involved in the original denial decision. For urgent or ongoing care, an expedited review may be available and can be completed within 72 hours. For non-urgent appeals, the standard timeline is typically 30 to 60 days. Supporting your appeal with specific documentation — a letter from your physician explaining medical necessity, clinical guidelines supporting the treatment, your medical records relevant to the service — significantly strengthens the case. Generic appeals without supporting documentation have a lower success rate than those with specific clinical justification.
External appeals: when the internal process fails
If your internal appeal is denied, you typically have the right to an external review by an independent organization not affiliated with your insurer. External reviews are governed by state or federal law depending on your plan type, and the external reviewer's decision is generally binding on the insurer. This is the process's most powerful mechanism — an independent clinical reviewer evaluating whether your insurer's denial was appropriate — and it's worth pursuing for any significant claim denial where you believe the treatment was clinically appropriate.
When to involve your employer or a patient advocate
If you receive health insurance through your employer, your HR department or benefits administrator may have experience navigating appeals with your specific insurer and can sometimes facilitate the process or escalate on your behalf. Patient advocacy services — available both through some employers and as independent paid services — specialize in navigating insurance appeals and can be worth engaging for high-stakes denials. State insurance regulators are also a resource: filing a complaint about a denial that appears to violate your plan's terms or state insurance law can sometimes prompt reconsideration even before a formal external appeal is completed.
- Request the specific, written reason for any denial before deciding whether and how to appeal
- File your internal appeal promptly, since most plans have a deadline — often 180 days from the denial
- Ask your physician to provide a letter specifically addressing the medical necessity of the denied service
- Pursue an external review if the internal appeal is denied and the amount at stake is significant
- Contact your state insurance commissioner if the denial appears to violate your plan's terms or applicable law
Frequently asked questions
Can I keep receiving treatment while an appeal is pending?
For ongoing treatment that was previously approved and is being retrospectively denied, you may have the right to continue care during the appeals process under certain circumstances. For prospective denials — treatments you haven't started yet — coverage typically isn't guaranteed during the appeal. Understanding which situation applies and discussing it with your provider before making treatment decisions is important.
What's the success rate of health insurance appeals?
Data varies, but studies have found that a significant percentage of external appeals — often in the range of 40% to 60% depending on the denial type — result in the denial being overturned. Internal appeals have variable success rates depending on the reason for denial, but are almost always worth pursuing before accepting a denial as final.
Does appealing affect my relationship with my insurer or future coverage?
No, appealing a denied claim is a legal right and cannot be used as grounds for canceling your coverage or increasing your premiums. Exercising this right is explicitly protected under federal law for most health plans.